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Volume 19, Number 1—January 2013

Dispatch

Seropositivity for Influenza A(H1N1)pdm09 Virus among Frontline Health Care Personnel

Kumar Alagappan, Robert A. SilvermanComments to Author , Kathy Hancock, Mary Frances Ward, Meredith Akerman, Fatimah S. Dawood, Alicia Branch, Sandra De Cicco, Evelene Steward-Clark, Megan McCullough, Karen Tenner, and Jacqueline M. Katz
Author affiliations: North Shore–Long Island Jewish Health System, New Hyde Park, New York, USA (K. Alagappan, R.A. Silverman, M.F. Ward, S. De Cicco, M. McCullough, K. Tenner); Hofstra North Shore–Long Island Jewish School of Medicine, Hempstead, New York, USA (K. Alagappan, R.A. Silverman, M.F. Ward); Albert Einstein College of Medicine, Bronx, New York, USA (K. Alagappan, R.A. Silverman); Feinstein Institute for Medical Research, Manhasset, New York, USA (K. Alagappan, R.A. Silverman, M.F Ward, M. Akerman); and Centers for Disease Control and Prevention, Atlanta, Georgia, USA (K. Hancock, F.S. Dawood, A. Branch, E. Steward-Clark, J.M. Katz)

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Table 1

Baseline characteristics of 340 health care personnel tested for seropositivity to influenza A(H1N1)pdm09 virus*

Characteristic No. (%) health care personnel, n = 193 No. (%) non–health care personnel p value
Sex

M

70 (36.3) 68 (46.3) 0.07

F

123 (63.7) 79 (53.7) NA
Age, y

<30

35 (18.1) 21 (14.3) 0.01

30–40

58 (30.1) 27 (18.4) NA

41–50

48 (24.9) 33 (22.5) NA

51–60

43 (22.3) 49 (33.3) NA

>60

9 (4.7) 17 (11.6) NA
Age, y (dichotomized)

<60

184 (95.3) 130 (88.4) 0.02

>60

9 (4.7) 17 (11.6) NA
Children <18 y of age in home 85 (44.0) 55 (37.4) 0.22
Received seasonal influenza vaccine during 2008 or 2009 190 (98.5) 123 (83.7) <0.01
Contact with household member with confirmed or suspected A(H1N1)pdm09 39 (20.2) 23 (15.7) 0.26
Clinical contact with confirmed or suspected A(H1N1)pdm09 146 (75.7) NA NA
Health care worker role

Attending physician

47 (24.4) NA NA

Resident physician

30 (15.5) NA NA

Registered nurse

58 (30.1) NA NA

Other†

58 (30.1) NA NA
Cared for primarily adults 126 (65.3) NA NA
Cared for primarily children 67 (34.7) NA NA
Influenza-like symptoms‡ during spring–summer 2009 81 (42.0) 53 (36.1) 0.27
ILI§ during spring–summer 2009 27 (14.0) 7 (4.8) 0.01
ARI¶ during spring–summer 2009 48 (24.9) 30 (20.4) 0.33

*NA, not applicable; ILI, influenza-like illness; ARI, acute respiratory illness.
†Patient care technicians, registrars, and other emergency department staff.
‡Any of the following: fever, cough, body aches, chills, headache, fatigue, runny nose, sore throat, diarrhea, nausea, and vomiting.
§Fever AND either cough or sore throat.
¶Two or more of the following: fever, cough, runny nose, sore throat.

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